A comb-shaped furnace having a water cooling column and the water cooling column

For use in the circulating fluidized bed boiler furnace water cooling column, the column is surrounded by a water-cooled water-cooled membrane walls from closing, the water cooling column comprising: a lower section, said lower section is a single cylinder, the side of the lower section the inner wall is provided with secondary air; upper section, said upper section comprises a plurality of sub-column; and a transition section via a transition section, the lower water-cooled membrane wall extending to the upper section, wherein: each sub-column by the surrounding synthesizing a water-cooled membrane wall segment corresponding to a water-cooled membrane wall extending upwardly from enclosure, and said plurality of points spaced apart from each other pillars.